If it is larger than the later value, then this would be a percentage decrease, which is sometimes written using a minus sign before the number e.g. Note that you always divide by the original (earlier) value regardless of it being numerically larger or smaller than the later one. As a percentage change, this becomes 0.05 (or 1/20th) × 100 = 5% increase. ![]() As a fraction of the original value, this is 18 ppm/360 ppm = 1/20 (or 0.05).For example, if you wish to calculate the percentage increase of atmospheric CO 2 levels, which were 360 parts per million (ppm) in 1995 rising to 378 ppm in 2005, then: Change between two given dates is often expressed as percentage change in which the figure at the later date is expressed as a percentage of the earlier one.Ĭalculation of percentage change is best done in stages. Repeated measurement of an environmental indicator makes it possible to assess change over time.
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